build custom layer of Dojo to speed up loading of tt-rss (refs #293)

[tt-rss.git] / lib / dojo / parser.js

/*
	Copyright (c) 2004-2010, The Dojo Foundation All Rights Reserved.
	Available via Academic Free License >= 2.1 OR the modified BSD license.
	see: http://dojotoolkit.org/license for details
*/


if(!dojo._hasResource["dojo.parser"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dojo.parser"] = true;
dojo.provide("dojo.parser");
dojo.require("dojo.date.stamp");

new Date("X"); // workaround for #11279, new Date("") == NaN

dojo.parser = new function(){
	// summary: The Dom/Widget parsing package

	var d = dojo;
	this._attrName = d._scopeName + "Type";
	this._query = "[" + this._attrName + "]";

	function val2type(/*Object*/ value){
		// summary:
		//		Returns name of type of given value.

		if(d.isString(value)){ return "string"; }
		if(typeof value == "number"){ return "number"; }
		if(typeof value == "boolean"){ return "boolean"; }
		if(d.isFunction(value)){ return "function"; }
		if(d.isArray(value)){ return "array"; } // typeof [] == "object"
		if(value instanceof Date) { return "date"; } // assume timestamp
		if(value instanceof d._Url){ return "url"; }
		return "object";
	}

	function str2obj(/*String*/ value, /*String*/ type){
		// summary:
		//		Convert given string value to given type
		switch(type){
			case "string":
				return value;
			case "number":
				return value.length ? Number(value) : NaN;
			case "boolean":
				// for checked/disabled value might be "" or "checked".  interpret as true.
				return typeof value == "boolean" ? value : !(value.toLowerCase()=="false");
			case "function":
				if(d.isFunction(value)){
					// IE gives us a function, even when we say something like onClick="foo"
					// (in which case it gives us an invalid function "function(){ foo }"). 
					//  Therefore, convert to string
					value=value.toString();
					value=d.trim(value.substring(value.indexOf('{')+1, value.length-1));
				}
				try{
					if(value === "" || value.search(/[^\w\.]+/i) != -1){
						// The user has specified some text for a function like "return x+5"
						return new Function(value);
					}else{
						// The user has specified the name of a function like "myOnClick"
						// or a single word function "return"
						return d.getObject(value, false) || new Function(value);
					}
				}catch(e){ return new Function(); }
			case "array":
				return value ? value.split(/\s*,\s*/) : [];
			case "date":
				switch(value){
					case "": return new Date("");	// the NaN of dates
					case "now": return new Date();	// current date
					default: return d.date.stamp.fromISOString(value);
				}
			case "url":
				return d.baseUrl + value;
			default:
				return d.fromJson(value);
		}
	}

	var instanceClasses = {
		// map from fully qualified name (like "dijit.Button") to structure like
		// { cls: dijit.Button, params: {label: "string", disabled: "boolean"} }
	};

	// Widgets like BorderContainer add properties to _Widget via dojo.extend().
	// If BorderContainer is loaded after _Widget's parameter list has been cached,
	// we need to refresh that parameter list (for _Widget and all widgets that extend _Widget).
	dojo.connect(dojo, "extend", function(){
		instanceClasses = {};
	});

	function getClassInfo(/*String*/ className){
		// className:
		//		fully qualified name (like "dijit.form.Button")
		// returns:
		//		structure like
		//			{ 
		//				cls: dijit.Button, 
		//				params: { label: "string", disabled: "boolean"}
		//			}

		if(!instanceClasses[className]){
			// get pointer to widget class
			var cls = d.getObject(className);
			if(!cls){ return null; }		// class not defined [yet]

			var proto = cls.prototype;
	
			// get table of parameter names & types
			var params = {}, dummyClass = {};
			for(var name in proto){
				if(name.charAt(0)=="_"){ continue; } 	// skip internal properties
				if(name in dummyClass){ continue; }		// skip "constructor" and "toString"
				var defVal = proto[name];
				params[name]=val2type(defVal);
			}

			instanceClasses[className] = { cls: cls, params: params };
		}
		return instanceClasses[className];
	}

	this._functionFromScript = function(script){
		var preamble = "";
		var suffix = "";
		var argsStr = script.getAttribute("args");
		if(argsStr){
			d.forEach(argsStr.split(/\s*,\s*/), function(part, idx){
				preamble += "var "+part+" = arguments["+idx+"]; ";
			});
		}
		var withStr = script.getAttribute("with");
		if(withStr && withStr.length){
			d.forEach(withStr.split(/\s*,\s*/), function(part){
				preamble += "with("+part+"){";
				suffix += "}";
			});
		}
		return new Function(preamble+script.innerHTML+suffix);
	}

	this.instantiate = function(/* Array */nodes, /* Object? */mixin, /* Object? */args){
		// summary:
		//		Takes array of nodes, and turns them into class instances and
		//		potentially calls a startup method to allow them to connect with
		//		any children.
		// nodes: Array
		//		Array of nodes or objects like
		//	|		{
		//	|			type: "dijit.form.Button",
		//	|			node: DOMNode,
		//	|			scripts: [ ... ],	// array of <script type="dojo/..."> children of node
		//	|			inherited: { ... }	// settings inherited from ancestors like dir, theme, etc.
		//	|		}
		// mixin: Object?
		//		An object that will be mixed in with each node in the array.
		//		Values in the mixin will override values in the node, if they
		//		exist.
		// args: Object?
		//		An object used to hold kwArgs for instantiation.
		//		Supports 'noStart' and inherited.
		var thelist = [], dp = dojo.parser;
		mixin = mixin||{};
		args = args||{};
		
		d.forEach(nodes, function(obj){
			if(!obj){ return; }

			// Get pointers to DOMNode, dojoType string, and clsInfo (metadata about the dojoType), etc.s
			var node, type, clsInfo, clazz, scripts;
			if(obj.node){
				// new format of nodes[] array, object w/lots of properties pre-computed for me
				node = obj.node;
				type = obj.type;
				clsInfo = obj.clsInfo || (type && getClassInfo(type));
				clazz = clsInfo && clsInfo.cls;
				scripts = obj.scripts;
			}else{
				// old (backwards compatible) format of nodes[] array, simple array of DOMNodes
				node = obj;
				type = dp._attrName in mixin ? mixin[dp._attrName] : node.getAttribute(dp._attrName);
				clsInfo = type && getClassInfo(type);
				clazz = clsInfo && clsInfo.cls;
				scripts = (clazz && (clazz._noScript || clazz.prototype._noScript) ? [] : 
							d.query("> script[type^='dojo/']", node));
			}
			if(!clsInfo){
				throw new Error("Could not load class '" + type);
			}

			// Setup hash to hold parameter settings for this widget.   Start with the parameter
			// settings inherited from ancestors ("dir" and "lang").
			// Inherited setting may later be overridden by explicit settings on node itself.
			var params = {},
				attributes = node.attributes;
			if(args.defaults){
				// settings for the document itself (or whatever subtree is being parsed)
				dojo.mixin(params, args.defaults);
			}
			if(obj.inherited){
				// settings from dir=rtl or lang=... on a node above this node
				dojo.mixin(params, obj.inherited);
			}

			// read parameters (ie, attributes) specified on DOMNode
			// clsInfo.params lists expected params like {"checked": "boolean", "n": "number"}
			for(var name in clsInfo.params){
				var item = name in mixin?{value:mixin[name],specified:true}:attributes.getNamedItem(name);
				if(!item || (!item.specified && (!dojo.isIE || name.toLowerCase()!="value"))){ continue; }
				var value = item.value;
				// Deal with IE quirks for 'class' and 'style'
				switch(name){
				case "class":
					value = "className" in mixin?mixin.className:node.className;
					break;
				case "style":
					value = "style" in mixin?mixin.style:(node.style && node.style.cssText); // FIXME: Opera?
				}
				var _type = clsInfo.params[name];
				if(typeof value == "string"){
					params[name] = str2obj(value, _type);
				}else{
					params[name] = value;
				}
			}

			// Process <script type="dojo/*"> script tags
			// <script type="dojo/method" event="foo"> tags are added to params, and passed to
			// the widget on instantiation.
			// <script type="dojo/method"> tags (with no event) are executed after instantiation
			// <script type="dojo/connect" event="foo"> tags are dojo.connected after instantiation
			// note: dojo/* script tags cannot exist in self closing widgets, like <input />
			var connects = [],	// functions to connect after instantiation
				calls = [];		// functions to call after instantiation

			d.forEach(scripts, function(script){
				node.removeChild(script);
				var event = script.getAttribute("event"),
					type = script.getAttribute("type"),
					nf = d.parser._functionFromScript(script);
				if(event){
					if(type == "dojo/connect"){
						connects.push({event: event, func: nf});
					}else{
						params[event] = nf;
					}
				}else{
					calls.push(nf);
				}
			});

			var markupFactory = clazz.markupFactory || clazz.prototype && clazz.prototype.markupFactory;
			// create the instance
			var instance = markupFactory ? markupFactory(params, node, clazz) : new clazz(params, node);
			thelist.push(instance);

			// map it to the JS namespace if that makes sense
			var jsname = node.getAttribute("jsId");
			if(jsname){
				d.setObject(jsname, instance);
			}

			// process connections and startup functions
			d.forEach(connects, function(connect){
				d.connect(instance, connect.event, null, connect.func);
			});
			d.forEach(calls, function(func){
				func.call(instance);
			});
		});

		// Call startup on each top level instance if it makes sense (as for
		// widgets).  Parent widgets will recursively call startup on their
		// (non-top level) children
		if(!mixin._started){
			// TODO: for 2.0, when old instantiate() API is desupported, store parent-child
			// relationships in the nodes[] array so that no getParent() call is needed.
			// Note that will  require a parse() call from ContentPane setting a param that the
			// ContentPane is the parent widget (so that the parse doesn't call startup() on the
			// ContentPane's children)
			d.forEach(thelist, function(instance){
				if(	!args.noStart && instance  && 
					instance.startup &&
					!instance._started && 
					(!instance.getParent || !instance.getParent())
				){
					instance.startup();
				}
			});
		}
		return thelist;
	};

	this.parse = function(/*DomNode?*/ rootNode, /* Object? */ args){
		// summary:
		//		Scan the DOM for class instances, and instantiate them.
		//
		// description:
		//		Search specified node (or root node) recursively for class instances,
		//		and instantiate them Searches for
		//		dojoType="qualified.class.name"
		//
		// rootNode: DomNode?
		//		A default starting root node from which to start the parsing. Can be
		//		omitted, defaulting to the entire document. If omitted, the `args`
		//		object can be passed in this place. If the `args` object has a 
		//		`rootNode` member, that is used.
		//
		// args:
		//		a kwArgs object passed along to instantiate()
		//		
		//			* noStart: Boolean?
		//				when set will prevent the parser from calling .startup()
		//				when locating the nodes. 
		//			* rootNode: DomNode?
		//				identical to the function's `rootNode` argument, though
		//				allowed to be passed in via this `args object. 
		//			* inherited: Object
		//				Hash possibly containing dir and lang settings to be applied to
		//				parsed widgets, unless there's another setting on a sub-node that overrides
		//
		//
		// example:
		//		Parse all widgets on a page:
		//	|		dojo.parser.parse();
		//
		// example:
		//		Parse all classes within the node with id="foo"
		//	|		dojo.parser.parse(dojo.byId(foo));
		//
		// example:
		//		Parse all classes in a page, but do not call .startup() on any 
		//		child
		//	|		dojo.parser.parse({ noStart: true })
		//
		// example:
		//		Parse all classes in a node, but do not call .startup()
		//	|		dojo.parser.parse(someNode, { noStart:true });
		//	|		// or
		// 	|		dojo.parser.parse({ noStart:true, rootNode: someNode });

		// determine the root node based on the passed arguments.
		var root;
		if(!args && rootNode && rootNode.rootNode){
			args = rootNode;
			root = args.rootNode;
		}else{
			root = rootNode;
		}

		var attrName = this._attrName;
		function scan(parent, list){
			// summary:
			//		Parent is an Object representing a DOMNode, with or without a dojoType specified.
			//		Scan parent's children looking for nodes with dojoType specified, storing in list[].
			//		If parent has a dojoType, also collects <script type=dojo/*> children and stores in parent.scripts[].
			// parent: Object
			//		Object representing the parent node, like
			//	|	{
			//	|		node: DomNode, 			// scan children of this node
			//	|		inherited: {dir: "rtl"},	// dir/lang setting inherited from above node
			//	|
			//	|		// attributes only set if node has dojoType specified
			//	|		scripts: [],			// empty array, put <script type=dojo/*> in here
			//	|		clsInfo: { cls: dijit.form.Button, ...}
			//	|	}
			// list: DomNode[]
			//		Output array of objects (same format as parent) representing nodes to be turned into widgets

			// Effective dir and lang settings on parent node, either set directly or inherited from grandparent
			var inherited = dojo.clone(parent.inherited);
			dojo.forEach(["dir", "lang"], function(name){
				var val = parent.node.getAttribute(name);
				if(val){
					inherited[name] = val;
				}
			});

			// if parent is a widget, then search for <script type=dojo/*> tags and put them in scripts[].
			var scripts = parent.scripts;

			// unless parent is a widget with the stopParser flag set, continue search for dojoType, recursively
			var recurse = !parent.clsInfo || !parent.clsInfo.cls.prototype.stopParser;

			// scan parent's children looking for dojoType and <script type=dojo/*>
			for(var child = parent.node.firstChild; child; child = child.nextSibling){
				if(child.nodeType == 1){
					var type = recurse && child.getAttribute(attrName);
					if(type){
						// if dojoType specified, add to output array of nodes to instantiate
						var params = {
							"type": type,
							clsInfo: getClassInfo(type),	// note: won't find classes declared via dojo.Declaration
							node: child,
							scripts: [], // <script> nodes that are parent's children
							inherited: inherited // dir & lang attributes inherited from parent
						};
						list.push(params);

						// Recurse, collecting <script type="dojo/..."> children, and also looking for
						// descendant nodes with dojoType specified (unless the widget has the stopParser flag),
						scan(params, list);
					}else if(scripts && child.nodeName.toLowerCase() == "script"){
						// if <script type="dojo/...">, save in scripts[]
						type = child.getAttribute("type");
						if (type && /^dojo\//i.test(type)) {
							scripts.push(child);
						}
					}else if(recurse){
						// Recurse, looking for grandchild nodes with dojoType specified
						scan({
							node: child,
							inherited: inherited
						}, list);
					}
				}
			}
		}

		// Make list of all nodes on page w/dojoType specified
		var list = [];
		scan({
			node: root ? dojo.byId(root) : dojo.body(),
			inherited: (args && args.inherited) || {
				dir: dojo._isBodyLtr() ? "ltr" : "rtl"
			}
		}, list);

		// go build the object instances
		return this.instantiate(list, null, args); // Array
	};
}();

//Register the parser callback. It should be the first callback
//after the a11y test.

(function(){
	var parseRunner = function(){ 
		if(dojo.config.parseOnLoad){
			dojo.parser.parse(); 
		}
	};

	// FIXME: need to clobber cross-dependency!!
	if(dojo.exists("dijit.wai.onload") && (dijit.wai.onload === dojo._loaders[0])){
		dojo._loaders.splice(1, 0, parseRunner);
	}else{
		dojo._loaders.unshift(parseRunner);
	}
})();

}